Keysight Technologies L4445A Configuration manual

Keysight Technologies
Brand
Keysight Technologies
Model
L4445A
Type
Configuration manual
Keysight Technologies
34945A, L4445A, and L4490A/L4491A
Configuration Guide
RF/Microwave switches are used in a wide variety of applications ranging from DC to over
50 GHz. These applications can include:
– Wireless Communications
– Broadband CATV
– Communication Satellites
– Test and Measurement Equipment
– Electronic Radar and Defense Systems
– Avionics
– Medical Electronics
– Space Programs.
High Frequency measurement systems can be configured to route RF/Microwave signals in a
variety of configurations including:
– Selection from multiple signal sources to a single output
– Selection of multiple input signals to a single measurement instrument
– Transfer switching to insert or remove a device in a signal path
– Matrix switching of multiple inputs and outputs
Keysight Technologies, Inc. is a leader in providing RF/Microwave switching solutions. Keysight’s
solutions include both RF/Microwave switch modules and switch driver instruments that control
discreet (external) switches and attenuators physically located at the site of the device under
test (DUT) or application.
The purpose of this configuration guide is to introduce you to the features of the Keysight
34945A, L4445A, and L4490A/L4491A family of RF/Microwave switching instruments, and to
assist you in the three step process of selecting and configuring your Keysight system:
Step 1: Select the switches/attenuators and their options for your application.
Step 2: Determine the type and number of distribution boards required, and the bracket and
cable kits required.
Step 3: Select the switch driver instrument or switch platform you plan to use.
Introduction
Step 1
Table 1. Common Keysight RF/Microwave Switches and Attenuators
Switch
model Description
Frequency
range
Reference
document
number 1
Coil
voltage
option
Position
indicator
option
DC
connector
option
Distribution board
[number of
switches/board]
Bracket kit 3
(Cable kit) 3
N1810UL
N1810TL
N1811TL
N1812UL
Un-terminated latching 3-port
(SPDT)
Terminated latching 3-port (SPDT)
Terminated latching 4-port
(bypass)
Un-terminated latching 5-port
DC – 2, 4, 20,
or 26.5 GHz
5968-9653E
124 402/403 2201
(DB9F)
Y1150A [8]
Y1152A [2]
Y1154A [6]
Y1170A: L4491A
Y1171A: L4490A
(Y1157A)
87104A
87104B
87104C
87106A
87106B
87106C
87106P
87106Q
87106R
87406B
87406Q
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
Low PIM Switch, SP6T 6-port,
latching, terminated
Low PIM Switch, SP6T 6-port,
latching, terminated
Low PIM Switch, SP6T 6-port,
latching, terminated
6-port matrix, terminated
Low PIM Switch, 6-port matrix,
terminated
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC - 4 GHz
DC - 20 GHz
DC - 26.5 GHz
DC – 20 GHz
DC – 20 GHz
5091-3366E
87104-80017
5965-7841E
87406-80005
024: 24 VDC
T24: TTL/5 V
CMOS
compatible
Included 161
(16-pin DIP) Y1151A [2] Y1172A
(Y1159A)
87204A
87204B
87204C
87206A
87206B
87206C
87606B
87606Q
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
6-port matrix, terminated
Low PIM Switch, 6-port matrix,
terminated
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 20 GHz
DC – 20 GHz
5965-3309E
5965-7842E
87606-80005
Included
024: 24 VDC
Included
N/A
161
(16-pin DIP)
Y1152A [1] Y1172A
(Y1159A)
87222C
87222D
87222E
87222R
4-port transfer
4-port transfer
4-port transfer
Low PIM Switch, 4-port transfer
DC – 26.5 GHz
DC – 40 GHz
DC – 50 GHz
DC- 26.5 GHz
5968-2216E
87222-80007
Included
24 VDC
Included 161
(16-pin DIP) Y1154A [2] Y1173A
(Y1158A)
Supported Keysight Switches
and Attenuators
The Keysight 34945A and L4445A
Microwave Switch/Attenuator Drivers and
the L4490A/L4491A RF Switch Platform
support virtually any RF/Microwave switch
or attenuator.
Table 1, shown on the following page, is
a list of commonly used and supported
Keysight switches and attenuators with
their recommended options. Use Table 1
to locate your switch(es)/attenuator(s) and
the accessories required. You may find it
necessary to refer to the table frequently
as you work through this guide.
Note that the switches, attenuators, and
accessories shown in Tables 1 and 2 are
not included with the instrumentation
and must be ordered separately! Use the
chart on page 13 to track your selections
as you determine your configuration.
03 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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Switch
model Description
Frequency
range
Reference
document
number 1
Coil
voltage
option
Position
indicator
option
DC
connector
option
Distribution board
[number of
switches/board]
Bracket kit 3
(Cable kit) 3
L7104A
L7104B
L7104C
L7106A
L7106B
L7106C
L7204A
L7204B
L7204C
L7206A
L7206B
L7206C
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
SP4T 4-port latching, un-terminated
SP4T 4-port latching, un-terminated
SP4T 4-port latching, un-terminated
SP6T 6-port latching, un-terminated
SP6T 6-port latching, un-terminated
SP6T 6-port latching, un-terminated
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
5989-6030EN
024 Included 161
(16-pin DIP) Y1151A [2] Y1172A
(Y1159A)
L7222C
4-port transfer latching, terminated
DC – 26.5 GHz 5989-6084EN Included Included 161
(16-pin DIP) Y1154A [2] Y1173A
(Y1158A)
8762A
8762B
8762C
8763A
8763B
8763C
8764A
8764B
8764C
8762F
Terminated latching 3-port (SPDT)
Terminated latching 3-port (SPDT)
Terminated latching 3-port (SPDT)
Terminated latching 4-port (transfer)
Terminated latching 4-port (transfer)
Terminated latching 4-port (transfer)
Terminated latching 5-port
Terminated latching 5-port
Terminated latching 5-port
75 ohms Terminated (SPDT)
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 4 GHz
5952-1873E
5964-3704E
024 N/A
8765A
8765B
8765C
8765D
8765F
Coaxial (SPDT),SMA
Coaxial (SPDT),SMA
Coaxial (SPDT),3.5 mm
Coaxial (SPDT),2.4 mm
Coaxial (SPDT), 75 ohm, SMB
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 40 GHz
DC – 4 GHz
5952-2231E
5091-2679E
324 n/a
8766K
8767K
8768K
8769K
Coaxial (SP3T)
Coaxial (SP4T)
Coaxial (SP5T)
Coaxial (SP6T)
DC – 26.5 GHz
DC – 26.5 GHz
DC – 26.5 GHz
DC – 26.5 GHz
5959-7831
024 n/a 060
(12-pin Viking)
Y1155A [2]
Y1155A [1] Y1175A
8767M
8768M
8769M
Coaxial (SP4T)
Coaxial (SP5T)
Coaxial (SP6T)
DC – 50 GHz
DC – 50 GHz
DC – 50 GHz
5988-2477EN
024 n/a 10-pin DIP Y1153A [2] Y1175A
(Y1158A)
U9397A
U9397C
8 GHz Solid State
18 GHz Solid State
300 kHz-8 GHz
300 kHz–18
GHz
5989-6088EN
Included n/a Solder terminals Y1155A [8] Y1170A: L4491A
Y1171A: L4490A
Table 1. Common Keysight RF/Microwave Switches and Attenuators (continued)
04 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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1. Product and technical overviews for the
switches and attenuators listed can be
obtained by document number from the
Keysight RF & Microwave Test Accessories
web site. Go to http://www.keysight.com/
find/accessories, select ‘RF & Microwave Test
Accessories,’ and search for the document
number. Additional information can also
be found in the ‘RF and Microwave Test
Accessories Catalog’ accessible from this site.
If viewing this document on-line, click on the
reference document link.
2. Starting in June 2010, the current interrupt
function (formerly Option 403) is a standard
feature for these switches. The serial number
information below shows which switch units
have the current interrupt function included as
standard.
N1810UL:
Serial numbers MY07244672 and later
N1810TL:
Serial numbers MY07247927 and later
N1811TL:
Serial numbers MY07244660 and later
N1812UL:
Serial numbers MY07240668 and later
3. Bracket kits apply to the L4490A and L4491A.
These kits include pre-assembled control
cables and hardware for mounting switches/
attenuators to the brackets and the bracket
assemblies to the L4490A and L4491A RF
Switch Platforms. Each bracket kit supports
multiple switches (Table 2). The Cable-only
kits are primarily used with the 34945A and
L4445A, but can also be used with the L4490A
and L4491A. These cables must be assembled
and each kit contains material to build multiple
cables (Table 2).
4. Information on these attenuators plus
additional information on other attenuators
can be found in the latest version of the ‘RF
and Microwave Test Accessories Catalog.’
Table 1. Common Keysight RF/Microwave Switches and Attenuators (continued)
05 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
www.keysight.com/find/34980a
Switch
model Description
Frequency
range
Reference
document
number 1
Coil
voltage
option
Position
indicator
option
DC
connector
option
Distribution board
[number of
switches/board]
Bracket kit 3
(Cable kit) 3
84904K
84904L
84906K
84906L
84907K
84907L
11 dB max, 1 dB steps, 4 sections
90 dB max, 10 dB steps, 4 sections
70 dB max, 10 dB steps, 3 sections
DC – 26.5 GHz
DC – 40 GHz
DC – 26.5 GHz
DC – 40 GHz
DC – 26.5 GHz
DC – 40 GHz
5963-6944
24 V
(standard) Included
10-pin DIP
(standard) Y1153A [2]
Y1174A
(Y1158A)
84904M
84905M
84908M
11 dB max, 1 dB steps, 4 sections
60 dB max, 10 dB steps, 3 sections
65 dB max, 5 dB steps, 4 sections
DC – 50 GHz 5988-2475EN
024 Included
10-pin DIP
(standard) Y1153A [2]
Y1174A
(Y1158A)
8494G
8494H
8495G
8495H
8496G
8496H
8495K
8497K
11 dB max, 1 dB steps, 4 sections
70 dB max, 10 dB steps, 3 sections
110 dB max, 10 dB steps, 4 sections
70 dB max, 10 dB steps, 4 sections
90 dB max, 10 dB steps, 4 sections
DC – 4 GHz
DC – 18 GHz
DC – 4 GHz
DC – 18 GHz
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 26.5 GHz
4
24 V
(standard) Included
12-pin Viking
(standard) Y1153A [2] Y1175A
Step 2
Distribution Boards, Bracket
Kits, and Cable Kits
Switches and attenuators are connected
to the Keysight 34945A and L4445A
Microwave Switch/Attenuator Drivers and
the L4490A/L4491A RF Switch Platform
through distribution boards installed
on the 34945EXT module (see System
Interconnections Defined).
There are five distribution boards (Y1150A
– Y1154A) designed to allow Keysight’s
most popular switches and attenuators
to be driven directly. A sixth distribution
board, the Y1155A, is designed to drive
virtually any switch or attenuator by
providing screw terminals to connect to
relay coils and position indicators.
The distribution board required for each
switch/attenuator model and the number
of switches/attenuators supported per
board (shown in brackets [ ]) are listed in
Table 1.
The Y115x distribution boards are passive;
they only provide socket headers or screw
terminals that interface external devices
to the 34945EXT. The distribution boards
do provide access to position feedback
signals that can be used to drive LED’s
to visually represent a signal path, for
example.
Bracket and Cable Kit Usage
There are six bracket kits and three cable
kits available separately for switch/atten-
uator installation and control (Table 1). The
number of switches/attenuators supported
per kit is summarized in Table 2.
The bracket kits apply to the L4490A
and L4491A Each bracket kit contains
hardware for mounting the switch to the
bracket and for mounting the bracket
assembly in the chassis.
The cable-only kits are primarily used with
the 34945A and L4445A, but can also be
used with the L4490A and L4491A.
Figure 1. The Y1150A – Y1155A distribution boards
06 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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Table 2. Bracket and Cable Kit Usage
Kit number Number of switches supported Control cable included Usage Notes
L4490A/L4491A Bracket Kits
Y1170A 5Yes L4491A Five brackets per kit. Cable is
pre-assembled.
Y1171A 5Yes L4490A Five brackets per kit. Cable is
pre-assembled.
Y1172A 5Yes L4490A
L4491A
Five brackets per kit. Cable is
pre-assembled.
Y1173A 6Yes L4490A
L4491A
Three brackets per kit. Two
switches per bracket. Cable is
pre-assembled.
Y1174A 5Yes L4490A
L4491A
Five brackets per kit. Cable is
pre-assembled.
Y1175A 5No L4490A
L4491A
Five brackets per kit. No cable
provided.
34945A/L4445A Cable Kits
Y1157A 4 —
34945A
L4445A
L4490A
L4491A
Cable only – must be assembled.
See Table 1 for applicable
switches and attenuators.
Y1158A 2 —
34945A
L4445A
L4490A
L4491A
Cable only – must be assembled.
See Table 1 for applicable
switches and attenuators.
Y1159A 2 —
34945A
L4445A
L4490A
L4491A
Cable only – must be assembled.
See Table 1 for applicable
switches and attenuators.
RF cable and connector
suppliers
There are several suppliers for RF cables
and connectors for the switches/attenua-
tors used within the L4490A and L4491A
RF switch platforms. For convenience,
three of these suppliers are listed below:
Pasternack Enterprises, Inc.
http://www.pasternack.com
Micro-Coax
http://www.micro-coax.com
S. M. Electronics L.L.C.
http://www.smelectronics.us
07 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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Step 3
Switch/attenuator driver
instruments and platforms
For many applications, it is necessary
to locate the switching device as close as
possible to the DUT. Discrete switches and
attenuators are used for this purpose. Opti-
mum use of these devices requires switch/
attenuator drivers that are specifically
designed to provide the following features:
– Digital Outputs to drive relay coils
in either pulsed or continuous drive
mode,
– Digital Outputs that can drive switch
position feedback LEDs,
– Digital Inputs to sense the position of
the switches,
– Power distribution between the power
supply, switches, and control logic,
– Report generation that indicates how
often switches have been actuated.
These features are standard with the
Keysight 34945A and L4445A Microwave
Switch/Attenuator Drivers and the
L4490A/L4491A RF Switch Platform
The 34945A and L4445A
microwave switch/attenuator
drivers
For test systems requiring additional func-
tionality, consider the 34945A Microwave
Switch/Attenuator Driver module. The
34945A is a one-slot, plug-in module used
with the Keysight 34980A Multifunction
Switch/Measure Unit. The 34980A
Typical connections of these system
components are shown in Figure 2.
The L4490A/L4491A RF switch
platforms
Also for dedicated or stand-alone
RF/Microwave switching applications
are the Keysight L4490A and L4491A RF
Switch Platforms. The 2U L4490A
and 4U L4491A allow the mounting of
switches and attenuators within a chassis.
Included with the L4490A and L4491A at
shipment are:
Item Description
5061-0701 LAN cross-over cable for
direct PC to L4490A/L4491A
connection.
L4490-61603 9-pin D-SUB extension cable
for supplying +24 V to the
34945EXT module.
34945EXT Extender module
(included in the L4490A and
L4491A chassis).
The internal configuration and typical
system connections are shown in Figure 3.
offers a 6.5 digit DMM, and supports a
host of switching and control modules.
LAN, GPIB, and USB interfaces plus a
full-feature front panel are standard with
the 34980A.
For dedicated or stand-alone RF/
Microwave switching applications,
there is the L4445A Microwave Switch/
Attenuator Driver instrument. The L4445A
is a 1U, ½-rack LXI (LAN eXtensions for
Instrumentation) version of the 34945A.
LXI is an instrumentation standard for
devices that use the Ethernet (LAN) as
their primary communications interface.
The 1U, ½-rack reference refers to the
L4445A’s physical size relative to standard
EIA rack cabinet dimensions.
Understanding what is included when
the 34945A or L4445A is ordered and
those accessories which must be ordered
separately, simplifies the configuration
process.
The following items are included with the
34945A and L4445A at shipment:
Item Description
5061-0701 LAN cross-over cable for
direct PC to 34945A/L4445A
connection.
8121-1289* 9-pin D-SUB extension cable
for supplying +24 V to the
34945EXT module.
34945EXT Extender module
(one is automatically added
to each 34945A and L4445A
ordered.)
8121-1339 CAT-5E RJ45 cable
(included with the 34945EXT
for communication between
extender modules).
*Not available from Keysight. Can be purchased locally or from the vendor L-COM
(http://www.l-com.com) as part number CRMN9MF-10.
08 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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Figure 2. 34945A and L4445A external connections
C O NT RO L BU S
A g ile n t T e c h no lo g ie s
L4445A
M ic ro w a v e S w itc h/A t te n u a to r D r iv e r
LA N
Re s et
A T TN
LA N
P W R
4321
4321
E X P A N S IO N B U S
P O R T 2
P O R T 1
N O T E T HE R N E T
S E E M A N U A L !
+V
E X T E R N AL
P O W E R IN P P U T
30 V D C M A X
I/ O A C C E S S
4321
4321
E X P A N S IO N B U S
P O R T 2
P O R T 1
N O T E T HE R N E T
S E E M A N U A L !
+V
E X T E R N AL
P O W E R IN P P U T
30 V D C M A X
I/ O A C C E S S
34945A Plug-in module
Keysight 34980A
LAN
hub/switch
* = standard LAN cables
LAN cross-over cables for direct
PC – 34980A/L4445A connection
if PC is non Auto-MDIX
(cable p/n 5061-0701)
Master 34945EXT connects to 1st slave
through Expansion Port 1. Expansion ports
on slaves are interchangesable.
Up to eight 34945EXT modules including the master per 34945A or L4445A
8121-1339
8121-1289
8121-1289
+24 V
+24 V
Keysight L4445A
I/O interfaces:
LAN
GPIB (optional)
34945EXT #1
(master)
34945EXT #2
(1st slave) Ext power
24V/12V/5V
+V
I/O interfaces:
LAN (shown)
GPIB
USB
*
*or
09 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
www.keysight.com/find/34980a
Figure 3. L4490A and L4491A internal configuration and typical connections
Keysight L4491A
LAN
hub/switch
Cable p/n 5061-0701
* = standard LAN cables
LAN cross-over cables for direct PC –
L4490A/L4491A connection if PC is non Auto-MDIX
Master 34945EXT connects to 1st slave
through Expansion Port 1. Expansion ports
on slaves are interchangeable.
External power supply required for all slave
34945EXT modules EXTERNAL to the L4490A/L4491A.
EXTERNAL
POWER INPUT
30 VDC MAX
Up to seven slave 34945EXT modules per L4490A or L4491A
+24 V supplied
from L4491A
+24 V supplied
from L4491A
+24 V supplied
from L4490A
34945EXT #1
(master)
Keysight L4490A
34945EXT #1
(master)
L4491A Option 002
34945EXT #2
1st slave
+V
I/O interfaces:
LAN
GPIB (optional)
*
*
*
or
10 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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Numbering schemes
The channel numbers associated with
each bank on the 34945EXT are shown in
the following chart. The channel syntax
for the 34980A (34945A), L4445A, and
L4490A/L4491A is also shown.
Bank Channels
(lower)
Channels
(upper)
Bank 1 01 – 08 11 – 18
Bank 2 21 – 28 31 – 38
Bank 3 41 – 48 51 – 58
Bank 4 61 – 68 71 – 78
– 34945A
<slot #> <ext #> <ch #>
- slot #: 1-8 (34980A)
- ext # : 1-8 (34945EXT)
- ch #: see chart
– L4445A
<1> <ext #> <ch #>
- ext # : 1-8 (34945EXT)
- ch #: see chart
– L4490A/L4491A
<1> <ext #> <ch #>
- ext # : 1-8 (34945EXT)
- ch #: see chart
34945EXT modules are numbered ac-
cording to their position in the daisy-chain
sequence relative to the master 34945EXT
which is ext # 1.
System diagnostics
Often the most common problems with
switches/attenuators connected to the
34945EXT through distribution boards
are related to the switch and attenuator
cables. A seventh distribution board, the
Y1156A Verification Board, is used to
provide visual confirmation of the signal
path from the PC to distribution board
banks 1–4. Verifying the path from the PC
to a selected bank helps isolate suspected
problems in the entire path from PC to
switch.
Many Keysight switches contain position
indicator options that allow for electronic
verification of the switch position. The
34945EXT contains circuitry to detect
these signals, and the Y1156A diagnostic
board can also be used to test the
functioning of this circuitry.
System Interconnections
Defined
The following sections describe the
interconnections and components of the
34945A, L4445A, and L4490A/L4491A as
shown in Figures 2 and 3.
PC to 34945A, L4445A, or
L4490A/L4491A
When connecting the PC directly to the
34980A (34945A), L4445A, or L4490A/
L4491A, the LAN cross-over cable (p/n
5061-0701) provided with the instruments
is used. If your PC supports Auto-MDIX
or contains a LAN card with Gigabit data
transfer rates, the cross-over cable is not
required. A standard LAN cable may be
used instead. For network configurations
that include a LAN switch or router
between the PC and the instruments,
standard LAN cables are used.
Connections from the PC to the 34980A
(34945A) are also available through the
34980A GPIB and USB ports. Connection
via the optional GPIB interface is also
available for the L4445A and L4490A/
L4491A. However, access to the instru-
ment Web interfaces is only available
through the LAN connection (see the
product user’s guide).
34945A, L4445A, or
L4490A/L4491A to 34945EXT
As described in Step 2, Microwave
switches/attenuators are connected to the
34945A, L4445A, and L4490A/L4491A
through distribution boards (Y1150A
– Y1155A) installed on the 34945EXT
module. The 34945EXT is divided into four
banks (1–4) organized by channel number.
Any distribution board may be installed in
any bank, and multiple distribution boards
of the same type may be installed on the
same 34945EXT module.
Each 34945A or L4445A configuration
must contain at least one 34945EXT
module (a “master”) with limits on the
configuration as follows:
– Up to eight 34945EXT modules
allowed per 34980A mainframe which
can consist of eight 34945A modules
each with one 34945EXT module,
a single 34945A module with up to
eight 34945EXT modules, or any
combination in between,
– Up to eight 34945EXT modules
allowed per L4445A.
The 34945A and L4445A are connected
to the master 34945EXT using the 9-pin
D-Sub extension cable (8121-1289)
through which +24 V is also supplied.
A (master) 34945EXT module is built into
the L4490A and L4491A chassis. Up to
seven 34945EXT modules (in addition to
the master) are allowed per L4490A and
L4491A. A second 34945EXT module
(the first slave) is available in the L4491A
chassis as Option 002.
34945EXT to 34945EXT
Multiple (slave) 34945EXT modules are
connected through the expansion bus
ports using standard (i.e. non cross-over)
LAN cables. A LAN cable (p/n 8121-1339)
is included with each 34945EXT for this
purpose. The master EXT module must be
connected to the first slave module via the
(master’s) Expansion Bus Port 1, and either
Port 1 or Port 2 of the slave EXT module.
The expansion ports on the slave modules
are interchangeable.
34945EXT to external
power supplies
All slave 34945EXT modules and those
external to the L4490A or L4491A chassis
must use an external power supply or
supplies. The 34945EXT can only support
one external voltage level (+24 V, +12V, +5
V) at a time which applies to all distribu-
tion board banks on the 34945EXT. An
external supply can also be used with the
master 34945EXT.
11 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
www.keysight.com/find/34980a
L4490A and L4491A RF switch
platform product options
There are five product options
available for the L4491A and one
option available for the L4490A. All
options are factory installed and must
be specified at the time of order. The
product options include:
L4491A
–Option 001: multiport front panel.
Front panel modification for
mounting up to eight multiport
switches. Includes mounting
hardware. Switch cables must be
ordered separately
(Y1159A – Table 1).
–Option 002: Adds an additional
34945EXT module internal to the
L4491A chassis (Figure 3).
–Option 004: Adds 16-bit digital IO
and 28 bits of relay drive lines.
–Option 005: switch mounting – bays
(default option)
–Option 006: switch mounting –
bottom tray
L4490A
–Option 004: Adds 16-bit digital IO
and 28 bits of relay drive lines.
L4490A/L4491A bracket
layout guidelines
Switches installed in the L4490A
platform or in the L4491A platform
with Option 006 can be mounted in any
orientation that optimizes or simplifies
switch or attenuator wiring.
For the L4491A with default
Option 005, switches and attenuators
may be mounted in any of the “bays” and
in any combination. Figure 5 shows the
typical number of given brackets (Y1170A
– Y1175A) that can be installed in a bay.
Figure 5. L4491A mounting brackets per bay
Figure 4. L4490A/L4491A product option locations
12 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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Internal/External Power
Supply Considerations
As shown in Figures 2 and 3, the channel
drive source for the master 34945EXT
is provided through the internal +24 V
power supply of the 34945A, L4445A, and
L4490A/L4491A. If necessary, external
supplies can be used. For either case, the
supply must meet the quiescent (continu-
ous) and switching current requirements of
the switches in your application.
Internal supply
When using the internal +24 V supply of
the 34945A or L4445A, the quiescent
current draw must not exceed 100 mA,
with a switching pulse current that does
not exceed 200 mA. The duration of the
switching pulse must be < 15 ms with a
25% duty cycle. The remainder of the duty
cycle (75%) allows recovery time for the
supply to provide the next pulse.
For the L4490A/L4491A, the quiescent
and switching currents from the supply
must not exceed the supply’s specification
of 600 mA continuous.
When current limits are exceeded,
overcurrent conditions can occur which
shuts down the internal supply. When this
happens, you must remove the device/
condition causing the overcurrent and
reset or cycle power on the instrument.
The quiescent current requirement of the
34945EXTs themselves is accounted for
by the internal supply rating and is not
included in quiescent current and switching
current calculations. Only the specified
currents (quiescent, switching) of the switch
must be considered.
As an example, the Keysight 87104/87106A,
B, C coaxial switches specify the following:
Supply current (switching: pulse width = 15 ms:Vcc = 24 VDC): 200 mA Nom
Supply current (quiescent): 50 mA Max
Using the internal +24 V supply, the current
required for actuating a 87104/87106
switch is:
[87104/87106 quiescent current] + [87104/87106 switching current]
[50 mA] + [200 mA]
= 250 mA (15 ms pulse, 50 mA quiescent)
The number of switches available and their
varying power requirements often make
it difficult to determine if the capacity of
the 34945A, L4445A, or L4490A/L4491A
internal +24 V supply will be exceeded. If
overcurrent conditions occur repeatedly
the use of an external power supply may be
required. Refer to the product user manuals
for more information.
13 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
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External supply
Each 34945EXT module is limited to 2 A
continuous current from an externally
connected power supply (4.75 V to 30 V).
The actual amount of power required by
each EXT module depends on the types of
switches used.
When using an external power supply
with either the master 34945EXT module
or slave 34945EXT modules (required),
the supply must be able to provide the
quiescent current requirement of the EXT
modules, plus the quiescent and switching
currents of the switches themselves.
The power requirement of the 34945EXT
is 1.2 W. For supported external supply
voltages of 24 V, 12 V, and 5 V, the current
required for a single EXT module is as
follows:
current = power / voltage
24 V: 1.2 W / 24 V = 50 mA
12 V: 1.2 W / 12 V = 100 mA
5 V: 1.2 W / 5 V = 240 mA
If multiple 34945EXT modules are driven
by a single external supply, the power
required from the supply increases by
1.2 W for each EXT module present. Thus,
if two EXT modules are driven by a single
supply, the power value in the equations
becomes 2.4 W – doubling the current
requirement.
Remember that the external supply must
also meet the quiescent and switching
current requirements of the switch. Using
the Keysight 87104/87106A, B, C coaxial
switches from the internal supply example,
the switch specifications again are:
Supply current (switching: pulse width =15 ms:Vcc = 24 VDC): 200 mA Nom
Supply current (quiescent): 50 mA Max
The quiescent current required for the
34945EXT module is:
[34945EXT quiescent current from 24 V]
[24 V: 1.2 W / 24 V = 50 mA]
Therefore, the current required from an
external supply for actuating a single
87104/87106 switch on a single 34945EXT
module is:
[34945EXT quiescent current from 24 V] + [switch quiescent current] + [switching current]
[24 V: 1.2 W / 24 V = 50 mA] + [50 mA] + [200 mA]
= 300 mA (15 ms pulse, 100 mA quiescent)
In summary, when using an external
supply, the current calculations must
include the quiescent current requirement
of the 34945EXT and the quiescent
current requirement of each switch. These
quantities are then added to the switching
(pulse) current requirement of the device.
14 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
www.keysight.com/find/34980a
Data sheets
Keysight 34980A Multifunction Switch/
Measure Unit
5989-1437EN
http://cp.literature.keysight.com/litweb/
pdf/5989-1437EN.pdf
Keysight L4445A Microwave/Attenuator
Switch Driver
5989-4828EN
http://cp.literature.keysight.com/litweb/
pdf/5989-4828EN.pdf
Keysight L4490A/L4491A RF Switch
Platform
5989-7857EN
http://cp.literature.Keysight.com/ litweb/
pdf/5989-7857EN.pdf
Application notes
Test System Signal Switching
5988-8627EN
http://cp.literature.keysight.com/litweb/
pdf/5988-8627EN.pdf
Benefits of a Switch/Measure Unit
for Data Acquisition and Electronic
Functional Test
5989-1481EN
http://cp.literature.keysight.com/litweb/
pdf/5989-1481EN.pdf•
34980A Multifunction Switch/Measure-
System Modules Applications that benefit
from specific module features/functions
5989-2371EN
http://cp.literature.Keysight.com/ litweb/
pdf/5989-2371EN.pdf
For additional information please visit:
http://www.keysight.com/find/34980A
http://www.keysight.com/find/L4445A
http://www.keysight.com/find/L449xA
http://www.keysight.com/find/L4490A
http://www.keysight.com/find/L4491A
Related Keysight Literature
15 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
www.keysight.com/find/34980a
16 | Keysight | 34945A, L4445A, and L4490A/L4491A - Configuration Guide
For more information on Keysight
Technologies’ products, applications or
services, please contact your local Keysight
office. The complete list is available at:
www.keysight.com/find/contactus
Americas
Canada (877) 894 4414
Brazil 55 11 3351 7010
Mexico 001 800 254 2440
United States (800) 829 4444
Asia Pacific
Australia 1 800 629 485
China 800 810 0189
Hong Kong 800 938 693
India 1 800 11 2626
Japan 0120 (421) 345
Korea 080 769 0800
Malaysia 1 800 888 848
Singapore 1 800 375 8100
Taiwan 0800 047 866
Other AP Countries (65) 6375 8100
Europe & Middle East
Austria 0800 001122
Belgium 0800 58580
Finland 0800 523252
France 0805 980333
Germany 0800 6270999
Ireland 1800 832700
Israel 1 809 343051
Italy 800 599100
Luxembourg +32 800 58580
Netherlands 0800 0233200
Russia 8800 5009286
Spain 800 000154
Sweden 0200 882255
Switzerland 0800 805353
Opt. 1 (DE)
Opt. 2 (FR)
Opt. 3 (IT)
United Kingdom 0800 0260637
For other unlisted countries:
www.keysight.com/find/contactus
(BP-9-7-17)
DEKRA Certified
ISO9001 Quality Management System
www.keysight.com/go/quality
Keysight Technologies, Inc.
DEKRA Certified ISO 9001:2015
Quality Management System
This information is subject to change without notice.
© Keysight Technologies, 2013 - 2018
Published in USA, January 19, 2018
5989-2272EN
www.keysight.com
www.keysight.com/find/34980a
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Keysight Technologies L4445A Configuration manual

Keysight Technologies
Brand
Keysight Technologies
Model
L4445A
Type
Configuration manual
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